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....~ ..r ... ..._ -..__ ~ -. _ , rnt i.:LC)N4i~ , ^:/ ~ V f rICE OF THE STATE ENGINEER -, Givision ni Water Resou rtes f?eparvnen~ „f Naloral Resources 1 +.73 Sherman Strew, Rcom 31 ~ Dcnw:r, Color300 8i)L1J I",On2: t?U!1 r1Lfi-3181 httP ',wam,.;la:e.ru.us.~beiault imu Mr. Richard T. Raines Tuttle Applegate, Inc. 11990 Grant Street, Suite 304 Denver, Colorado 80223 STt~TL OF COLORP~DO Aprtl 2, 2001 Re: Fort Lupton Gravel Pit, Substitute Water Supply Plan DMG File No. M-85-088 NE'/+ NW'/< Section 12, T1 N; R67W, 6th P M. Water Division 1, water District 2 Dear Mr. Raines: a~'-~ a ~~ A~ l~(. ~~ ,, ~~ ~~ Bill ra.~en 4;oeemor GBS E. W ilrhv Faecurrve Du•,-rn, ilal D Simpscn. P E Sure ".ngsa~r This letter is in response to your application of August 29, 2000 and amendment dated March 2, 2001 requesting a substitute water supply plan for a sand and gravel pit to be operated by Western Mobile, Inc., a subsidiary of Lafarge Corporation. (Lafarge), in accordance with 37-80- 120 C.R.S. The required fee of $1,343 for the substitute watersupply plan has been paid. -' This pit was previously operated by another entity without a substitute water supply plan, This previous operator exposed 4.0 acres of groundwater as part of the aggregate operation. Lafarge recently purchased the site and is in the process of securing adjacent propert`j for future mining operations. According to information submitted, no ;foundwater was exposed prior to January 1, 1981. Current plans include wet mining of the sites during 200t. The Applicants shall be responsible for compliance with this plan, but the State Engineer's Office may also pursue the landowner, for eventual compliance. You estimate the annua( depletion to the South Platte River dufa to operation cf the Fort Lupton Pit to be 34.9 acre-feet per year. This total includes. 26.6 acre-feet of evaporative losses from approximately 9.0 acres of exposed grcundwater, 1.0 acre-feet of water lost with dust suppression and 7.4 acre-feet of water lost with the mined :jroduct. Anon-tributary Arapahoe aquifer well along Plum Creek near Sedalia, Colorado (approximately ;i0 miles upstream of the pit) will be used to replace depletions. Transit losses have been estimated assuming a 0.25 percent loss per mite or about 4.4 acre-feet. Total replacement water required from the well is 39.3 acre-feet per year. The Fort Lupton P;t is located approximately 4,000 feet from the South Platte River. The Applicant has provided a monthly schedule of lagged depletions to the ri~aer system, together with a schedule of replacement requiremer,is totaling 39.3 acre-feet. The:;e replacement amounts represent the distribution of lagged depletions after ten years plus the difference between the actual depletion at the pit and the lagged depletion pro-rated over the year. The resulting replacement schedule returns the full depletion amount to the South Platte River on an annual basis.